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## org.bouncycastle.crypto.signers
Class DSTU4145Signer

    java.lang.Object
      org.bouncycastle.crypto.signers.DSTU4145Signer

All Implemented Interfaces:
  DSA, DSAExt

public class DSTU4145Signer
extends java.lang.Object
implements DSAExt

DSTU 4145-2002

National Ukrainian standard of digital signature based on elliptic curves (DSTU 4145-2002).

Constructor Summary
`DSTU4145Signer()`

Method Summary
`protected ECMultiplier` | `createBasePointMultiplier()`
`java.math.BigInteger[]` | `generateSignature(byte[] message)` sign the passed in message (usually the output of a hash function).
`java.math.BigInteger` | `getOrder()` Get the order of the group that the r, s values in signatures belong to.
`void` | `init(boolean forSigning, CipherParameters param)` initialise the signer for signature generation or signature verification.
`boolean` | `verifySignature(byte[] message, java.math.BigInteger r, java.math.BigInteger s)` verify the message message against the signature values r and s.

Methods inherited from class java.lang.Object
`clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

Constructor Detail

### DSTU4145Signer

    public DSTU4145Signer()

Method Detail

### init

    public void init(boolean forSigning,
                     CipherParameters param)

  Description copied from interface: `DSA`
  initialise the signer for signature generation or signature verification.

  Specified by:
    `init` in interface `DSA`
  Parameters:
    `forSigning` - true if we are generating a signature, false otherwise.
    `param` - key parameters for signature generation.

### getOrder

    public java.math.BigInteger getOrder()

  Description copied from interface: `DSAExt`
  Get the order of the group that the r, s values in signatures belong to.

  Specified by:
    `getOrder` in interface `DSAExt`

### generateSignature

    public java.math.BigInteger[] generateSignature(byte[] message)

  Description copied from interface: `DSA`
  sign the passed in message (usually the output of a hash function).

  Specified by:
    `generateSignature` in interface `DSA`
  Parameters:
    `message` - the message to be signed.
  Returns:
    two big integers representing the r and s values respectively.

### verifySignature

    public boolean verifySignature(byte[] message,
                                   java.math.BigInteger r,
                                   java.math.BigInteger s)

  Description copied from interface: `DSA`
  verify the message message against the signature values r and s.

  Specified by:
    `verifySignature` in interface `DSA`
  Parameters:
    `message` - the message that was supposed to have been signed.
    `r` - the r signature value.
    `s` - the s signature value.

### createBasePointMultiplier

    protected ECMultiplier createBasePointMultiplier()

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